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Transistor Specification Selection Guide Frequency Range as an Oscillator   Bipolar Transistors   AT-415xx   to 4 GHz   AT-320xx   to 5 GHz   AT-305xx   to 5 GHz   AT-420xx   to 6 GHz   AT-414xx   to 8 GHz   HBFP-0450   to 8 GHz   AT-310xx   to 10 GHz   HBFP-0420   to 10 GHz   HBFP-0405   to >12 GHz 0.1 0.2 0.5 1.0 2.0 5.0 10 20     Frequency [GHz]                                                                                                       Field Effect Transistors   ATF-10xxx   2-12 GHz   ATF-35xxx   2-12 GHz   ATF-34xxx   2-12 GHz   ATF-38xxx   2-12 GHz   ATF-33xxx   2-12 GHz   ATF-26xxx   2-18 GHz   ATF-13xxx   2-18 GHz   ATF-36xxx PHEMT     2-20+ 0.1 0.2 0.5 1.0 2.0 5.0 10 20     Frequency [GHz]                                                                                                     What: the RF output frequency of an oscillator Direction: needs to match the application. Changes in frequency due to changes in bias (pushing), load impedance (pulling), or temperature must also be acceptable. For a VCO, the tuning linearity (rate of change of frequency vs. tuning voltage) is typically also a critical specification. These parameters depend on circuit design (especially resonator Q) as well as the properties of the transistor. Range: kHz to 10 GHz (bipolars) MHz to 20 GHz (FETs)

this page last updated: 20 October 1999